Mosby — an avid Prince fan — attended the show after her husband, City Councilman Nick Mosby, got the tickets as a Mother's Day gift, according to her office.
Mosby was "simply invited by Prince on stage during the concert," Mosby's spokeswoman Rochelle Ritchie said Monday. She said Mosby had no plans to get on stage beforehand, saying the appearance was "not something that office tried to get."
Ritchie said she did not know exactly how Prince connected with the city's top prosecutor at the show.
The councilman did not immediately respond to a request for comment on Monday. And an email to Prince's spokesperson was not immediately returned Monday.
Earlier this month, Mosby announced criminal charges against all six Baltimore police officers involved with the arrest of Gray, 25, who died April 19, a week after he was taken into police custody.
Prince announced that a portion of the concert proceeds would go to Baltimore-based youth charities, though it's unclear what portion of the tickets — which cost between $22 and $497 before fees — will be donated or to which charities the funds will go.
The show was held in response to the protests and riots in Baltimore last month following the death of Gray.